Skid marks and other evidence are often not well measured after an accident. Therefore, we have honed our ability to make maps from photographs.

In one case, only the ends of the skid marks were measured, but we needed their curvature to establish trajectories for two young men who were hit.







In another case, although the shape of the marks was complicated, only the lengths of the marks was measured.







In a third case, the NTSB took over from local officials. Their measurement of the final resting place of the tanker was at odds with what the local officials measured. Because of this, the NTSB's reconstruction was not accurate. We used photogrammetry to determine the truth of the matter.